Grinding-machine.



-"mnms. GRINDING EAG'HINE.

APPLICATION FILED DBO.15, 190B.

Patented Jan. 4, 19 10.

Elywzutoz 4 SHEETS-SHEET 1.

' Wane sacs A. B. LANDIS.' GRINDING;- MACHINE. APPLICATION FILED 1320. 16; 199 V Patented 'Jan; 4, 1910.

A 13.. LANDI'S I GRINDING IVFMTHINH A PPLIOATIONIILBD 1 130.15, 1906.

Patented Jan. 4, 1910.

4 SHEEN-SHEET 4.

nmumlnmnnn B. LANDIS, or WAYNESBOIRLO, P NNsYtvANIA, assrenon T LANnrs Toot.

COMPANY, A CORPORATION OF PENNSYLVANIA. v

. GRINDING-MACHINE.

Specification of Letters Patent.

Application filed December 15, 1906. Serial No. 347,977.

To all whom it may cdn cerni Be it known that I, ABRAHAM B. LANDIS,

a citizen of the United States, residing at \Vaynesboro, in the county of Franklin and State of Pennsylvania, have invented certain new and useful Improvements in Grinding- Machines, of which the following is a specification.

In the operation of grinding machines where a carriage is employed which traverses back and forth across the machine, extra power is required at the end of each'movement to overcomethe momentum of the carriageand start it backin-the reverse direction, particularly whenthe carriage and they mechanism carriedthereby' are of a heavy character;- The stopping of themotion of the carriage in one directionv and starting 1t 1n the reverse directionnot only requires power. in excess of thatl'trequiredfor' the straight away operation in either direction but causes a shockand hea strain and wear upon the parts. of the ge r and reversing mechanism employed and also a vibration in the machine sometimes affecting. the work,

-necessitating that'they bemade of extra 'weight andstren'gth. v

. r The object of my. said invention is topro- 7 less weight and strength, and the vibration videmeans whereby this shock is not only cushionedand the strainthereofon the mechanism relieved, when the carriageis brought to a stop and'startedin the opposite direction but also whereby the power required 'instopping the carriage may be stored and used to assist inovercoming the inertia of the carriage and to start it the reverse direction, therebynot only relleving the machine of a great deal of the ordinary strain and wear but enabling the work to be per: formed with less power, the parts to be of- .themachine incident to the shock be' avoided, thus not only reducing the expense of operation but the expense of construction "and increasing'the life andefliciency of the 1 machine as well, all as'will be hereinafter more fully described and claimed.

- which are made a part hereof and: on which parts,'Figure 1 is a side elevation of the similar reference characters indicate similar P work supporting'sideof a grinding machinethejstructure' shown d is mounted.

embodying my said invention, Fig. 2 atrans verse sectionthrough the machine on the dotted' line 2 2 in Fig. '1, Fig. 3 a detail view on an enlarged scale of a part of the Patented Jan. 4;,

mechanism illustrated inFig. 2, being shown I partly in section and partly in elevation, Fig. 4 a cross section looking in the direction indicated by the dotted line k t in Fig. 3, Fig. 5 a cross section looking in the direction indic'atedby the dotted line 5-.5 in Fig. 4:,

Fig. 6 across section looking in the direction indicated by the-arrow 6 6 in-Fig. 3, Fig. 7 I

a detail view on an enlarged scale of a portlon-of Fig. ,1, Fig. 8 a detail view of the reversing gear, Fig. 9 a cross section thereof as seen when looking in the direction indicated by the arrows from the dottedline -99 in Fig. 8, and Figs. 10, 11 and 12 detail views showing the form of separateparts of particularly in Fig. 6

more clearly.

In said drawings the portions marked A represent the bed of the machine, B the ,car- I 'r age, C the slider, D the grinding wheel head stock and footstock base and E E the respectively.

.The general construction ofthe' machine is similar to that shown in "myP atent No.

639,900 of December 26, 1899, and a brief description only of the main stru'cturewill,

therefore, be suflicient herein, as the details of the construction and operation can be readily ascertained by reference to said former patent, the machine shown therein being in general use and familiar to those skilled in the art.

The bed A is a hollow casting of suitable.

form to support the several parts and bearings,-provided on one. side with ways a and a on which the carriage B is mounted to travel and on its opposite side with a work supportingtable A on which is mounted the head stock E and foot stock E adapted to support the 'work in position to be ground. The slider. G is mounted in the usual or any approved manneryon the top of a transverse slide B" on the top of table B and-has the grindingwheel'base D supported and'adapt- .ed to be operated-thereon, as-sh'own in sev- Referringv to the accompanying. drawings era-l of my former patents, or. in any ap- A rack-bar B is mounted-on the under-- side of carriage B to'extend longitudinally-'- 2. Another-shaft 11 alongside shaft a has strike 31 with which said dogs are adapt 'the frame A alongside said shaft 10.

o of the travel of'the carriage; Thus far thereof and is engaged by a pinion l on the inner end of a transverse shaft-2 mounted in suitable bearings and 71 in the frame and having a hand-wheel 3 on its outer end by which it may be turned to rotate said shaft and traverse said carriage back and forth by hand. The power driving mechanism comprises a main shaft' l mounted in suitable bearings 7 2 and 73 in the frame or bed of the machine and has a cone-pulleyfi by which it may be belted to anyJ-Jsuitable power. it is provided with a long gear 6 adapted to mesh with aloosely mounted pinion 7 ona counter shaft 8," which cou'nte'r shaft has a pinion 9 adapted to mesh with a gear 10 on' the shaft a pinion 1 2 which also meshes with pinion 6 on shaft 4 and another pinion Yet which meshes witha loosely mounted gear 13 on shaft 8. A double-faced clutch 1%- mounted between clutch parts and it; 'on the adjacent faces of the hubs or gears 7 and'l8, being secured to shaft 8 by,

means of a spline. A shifting fork mounted on a rock-shaft 16 is adapted to engage and throw said clutch part 14 back and forth into one or the other of the clutch parts on said wheels 7 and 13. A levecll is provided on said shaft 16 by which said shifting fork may be thrown by hand and an arm l8'extends downwardly from said-reclishaft and is connected by a link 19 to an arm 20' on a wheel 21 mounted around shaft 2 near its outer end. Another small gear 22 is mounted on shaft 2 adjacent to gear 10 and adapted to mesh with a gear wheel 23 on a short shaft 24 mounted in a bearing in he outer end ofsaid shaft 24 is provided witha pinion 25 adapted to mesh with teeth on the exterior of a circular flange 26 on the rear side of a wheel 27 mounted on said shaft 2; The wheel 21 is mounted to rock on said flange 26 between said teeth and the rear side of said wheel. 27 Said wheel 2'? is provided with adjustable dogs 28 and 29 on its periphery and the wheel 21 is provided with an upwardly projecting-arm 30 car 5; ei.

to contact. Thus as said shaft rot fies it operates through the gear just described to slowly move the wheel 27 until one of the dogs 28 or 29 contacts' with the strike 31 which operatesto rock the wheel 21 around its bearing on fiange26 of wheel 27,a'n d lower arm 20 thereof,- operates the rock-- through the link 19 connected with the shaft16'to shift the clutch part 1- from en gagement with one of the wheels 13 or 7 to the other and thus, :throughthe train of gearing before described, shift the directio construction, arrangement and operation of the mechanism s substantially theysame as that shown m'thejabove mentioned mounted upon a sleeve 40, which sleeve has a circular flange 41, which has a rearwardly projecting arm 4C2 at its outer edge at two diametrically opposite'points. Said sleeve is secured to the shaft 2 by means of screws 43 a which project through radial perforations in said flange ll, the lower end of each of which is screw-threaded and contains a screw 4:3 adapted to screw into sockets or radial holes in said shaft, thus securing said sleeve rigidly in position on said shaft. (in the rear side of wheel 10 is a projecting segmental lug 44 which is cast in piece or may be rigidly secured to the back side of said wheel. Projecting strikes as having their adjacent faces provided with cushions 16, preferably of leather,- and formed with right angular flanges 47 are adjnstably "secured in a circumferential T- shaped groove 48 in the front of flange 41 on said sleeve %0 by means of bolts 49, theheads of which are mounted in said groove "and the outer ends of which are provided with nuts 50 by which said strikes maybe clamped in any desired position in said groove around said flange. 'By this means I as will be readily seen, said wheel 10 may be given a limited movement independent of said sleeve 40, the extent of which may be regulated by the adjustment of said strikes so. A wheel 51 having teeth on its periphery is mounted loosely upon the rear end of said sleeve 420 and is formed with two pockets in its inner face on opposite sides and near s periphery, each of which extends in a rcular direction so that the two pockets nearly form a circle being separated from each other by sections 53 through which are cut slots 5% of sufficient width to receive the arms l2 on the rear side of the flange %1 on sleeve so. Heavy coiled springs 55 are mounted in said pockets, the ends of said springs resting against the ends of the pockets formed by the sections 53. The arms 42,

normally positioned between said springs 5 in the slots 54. Rollers 56 are preferably mounted on part o-f the coils of said springs suitable distances apart and are adapted to in a narrow groove 5? in the outer wall said pockets, thus serving to PIE'.

11 said s projecti between the ends of said springs 55 the i ion of the springs being sufficient to carry said wheel without compressing them. 'A pawl 15? is'mounted upon a reel? shaft '58 adjacent to the periphery o f said wheel 51 andadapted to engage with'the teeth thereof. Said shaft 58 extends parallel with theshaft 2, being mounted, in suitable as the wheel '21, with the arm 20 thereon, is."

moved back and forth. 1 P e In the position shown in Figs. '4 and 7 the pawl 57 is shown inengagement with the notches of the periphery of wheel 51,

which position the'parts will occupy just as V the mechanism is beginnin to operate to 'rock' wheel 21 and shiftjclutch part'14 to.

reverse the travel of the carriage andat the point when said clu'tc part is being moved, awayfrom the clutch with which it has just been engaged. During, the time that the point of cam '62 is passing over the pointo f 'ca1n60 the'pawl57 is held in engagement withthe teeth on the rim of wheelv 51 and.

said wheel is thus locked from rotation while the wheel 10 and the sleeve 40.con-

tinue their movement-for ashort distance until. the clutch part 14 is entirely freed from engagement with the clutch part on? that one of the wheels 7 or 13 with which it is in engagement and the momentum of the carriage is overcome and said carriage brought to a stop. Thisco'ntinued, move-s ment of wheel 10 and parts connected therewith after the locking of the wheel 51 throws thearms 42 on the flange 41 against the adjacent ends of springs 55 in the pockets 52 which springsthus serve as a cushion to receive the shock and strain of stopping" the carriage, which compressessald springs,

which thus take up and store the power required to overcome said momentum. 'As the carriage is thus brought to a stop and be fore the clutch'p'art 14 eng ge? With the opposite wheel 7 or 13 from the one with which it has just been disengaged, said-springsbegin to expand and exert the power thus stored to start the sleeve 40 and; shaft-i=2 in the reverse direction so that the'clutch part 14 meets 'the clutch part'on the wheel. 13 or 7 v opposite from the one with which'it has just been disengaged without any load except the gearing itself and when said parts.

are just ready to start in the reverse direction, the inertia of the carriage being largely overcome by theforce of the springs thus exerted, whleh r'eheves the reverslng gearv .and mechanism of the shock and strain which would otherwise result from this op- .eration. The came 60 and (12 have. in'the mean time been moved so that the points thereof will have passed each other and the secure by Letters; Patent, is

pawl 57 allowed to fall ,Out of engagement -with the wheel 51, which is thus'permitted to rotatewith the sleeves 140 as before de-' "scribed, 'andwheel 10 will have'been turned to bring the opposite side of ,the lug 44'.

against the'opposite strike.45 and the reverse movement will thus be continued un-. der the positlvely driven gearing, asbefore described. Thus at each reversal of the car'- riage,'wheel 51 is momentarily .lockedand the force-of the movement of the carriage is momentarily thrown against the. springs 55 and thus the movement of the carriage is stopped bythe'resistance of said springs.

which,. immediately upon the momentum of the carriage in one direction being-overv come, start to expand and exert the power required to stop the carriage and compress with limited independent movement imust be turned: to brihg the opposite side oft-he lug 44against the opposite strike 45 before the power by which the machine is driven is brou ht into .serfitice to drive thecarriage.

,thus a ording the time requiredfforthe op-I' erati-on of the springs as above set-forth. which operation takes place ateach reversal -them, toward starting it back in' the oppo- ,slte direction. The wheel 10 being mounted ofthe carriageat'each end of'the machine,

as will be readily understood: j The, strikes 45 are adjustable to different positions for the purpo'se'of giving a varied 'delay or stop to the carriage at the time of reversing in order to allow the work to re- .volve a fraction orlwhole revolutionl before the grinding wheel carriage starts in the opposite direction, this being sometimes desirable for some kinds of work. By this.

arrangement the shockand strain on the mechanism incident to reversing the earriage is overcome. andthe need of extra powerandstrength of parts to provide for the reversing operation is obviated- Having thus fully described'fmy said in vention, what I' claim' as new and desire to 1. In a grinding machine, the combination of the carnage, means for 'traversmg S l1(l carriage, means for reversingY-thetravel of ,the carr1age,,a nd means for} ishiomng the stopping of said carriage 'at l achreversal.

- which meanscomfprises-a compressible cushion adapted to expand-as soon as the carriage is stopped and connected to the driv- 1 'ing shaft to exert its power thu's storedv by the stoppingofthe carriage tow'ardstart-ing it back -in the" reverse direction,substantially- I as set forth.

of the" bed, the carriage,-aj shaft geared to 2. In agrindin'gmachine, thecombination traverse said carriageback and forth, gear ing connected sald shaft foro'p'era-ting V it in either direction, said gearingcomprising a gear wheel mounted-tohavea. limited lndependent movement on. a sleeve, 531d msleeve. secured rigidly to said shaft, a part a compressible cushioningdevicc with which said sleeve'ais connected,- and I means for locking said partcarrylng the cushion momentarily ateach reversal of the carriage,

whereby-said carriage is operated to com-. press said cushion until the carriage stops and then said cushion may expand to assist in starting. the carriage; in the reverse direction, substantially as "set forth.

3. In-agrinding machine, the combination of the bed, the carriage, mechanism for traversing said carriage, means'for reversng the travel of the carriage, and a cushioning device for relieving the shock and strain upon the gearing comprising a-part munted-upon the carriage? driving shaft and connected to the gear .for driving said shaft, which part is formed with projections adapted to extend between springs mounted insuitable pockets in another partmounted on said shaft and adapted to normally rotate therewith, means for locking said part Containing the pockets and springs temporarily at each reversal of the carriage, and means for releasing said part when the driving mechanism is reengaged to drive the carriage in the reverse direction, substantially as set forth.

4. The combination, with the driving shaft of a'traversing carriage, of reversing :mechanism for changing the direction of motion of said carriage at predetermined points.,and a ci'ishionii'ig device mounted on said shaft comprising springs mounted in pockets ina part mounted to rotate with said shaft and connected with adriving gear thereon, and means for locking said part containing said springs 'momentarily at each reversal of the carriage, substantially as set forth.

The combination with' the carriage driving shaft, of a. grinding machine, of

gear for reversing the motion of said shaft at predetermined.points, a cushioning devicemounted on said shaft comprising a partadapted to rotate with the driving wheel and formed with pockets containing springs between the ends of which pro1ect {arms or lugs driven by said driving wheel;

means for locking said part containing the springs at eachreversal of the movement of said shaft, means for momentarily disconnecting the driving gear from said shaft, and means for unlocking said part when the driving gear is reengaged with said shaft, whereby said springs are compressed by the momentum of the carriage in stopping and allowed to expand to in reversing the motion thereof after it has stopped,substantially as set forth.

(3. The combination with the carriage driving shaft, of a grinding machine, of a gear for reversing the motion thereof, a

cushioning device mounted on said shaft for taking up the shock and strain incident to stopping the carriage at the end of each movement, said cushioning device comprising a partmounted to revolve with the driving gear wheel on said shaft-and containing pockets in which are. mounted springs, said driving gear wheel having a partconnected therewith, having arms which project between the ends of said springs, meansfor locking said part carrying said springs when the carriage reaches the end ofits movement, means for releasing the driving gear from the driving shaft at the same point, whereby the momentum of the car riage is thrown upon said springs'and' compresses them, and means for unlocking said part when the driving gear becomes reengaged to drive the shaft in the opposite direction, suliistantially as set forth.

7.111 a grinding machine, the combina whereby the strain of overcoming the momentum of the carriage is thrown upon said springs and tends to compress them and as soon. the carriage is stopped'their power of expansion is exerted to start the carriage in the opposite direction, and means for unlocking said wheel or disk carrying the springs when the driving gear is reengaged, substantially as set forth. 4

S, In a'grinding machine, the combination with the carriage driving shaft, of the driving mechanism, the reversing mechanism, the driving mechanism being geared to a driving wheel on said carriage driving shaft, said driving w'heel being mounted upon a sleeve to have a limited independent movement thereon, said sleeve secured rigidly on said shaft and formed with projecting parts, a disk or a wheel also mounted on said sleeve having pockets and having springs mounted in said-pockets, said arms extending between the ends ofsaid springs, i,

and-means for locking said disk or wheel controlled by the operation of the reversing mechanism, substantially as set forth.

9 In a grinding machine, the combination with the carriage driving shaft, of the. driving mechanism, the reversing mechanism, means for automatically operating said reversing-mechanism, comprising ad'- justable strikes adapted to contact with and operate the shifting clutch, said adjustable dogs mounted on a part operated by a train of gear from said carriage driving shaft, the gear wheel on said carriage driving shaft, the cushioning device mounted on saidcarriage driving shaft, and means for momentarily locking the parts carrying the cushion at the time of the reversal of the carriage, said locking device being operated by the same part which operates the reversing gear,

whereby said cushioning device is adapted to receive the shock and strain incident to stopping the carriage and assist in reversing its motion, substantially as set forth.

10. In a grinding machine, the combination, with the carriage driving shaft, of the driving mechanism, the reversing mechanism, means for operating said reversing mechanism comprising a rocking lever adapted to be operated by adjustable dogs on a wheel mountedon the carriage driving..-sha t 'and'operated by a train of geari g-flf in said shaft, and a cushioning devlce mounted on said carriage driving shaft comprising a disk having pockets containing compressible springs, projections carried by the operating gear wheel extending between said springs, teeth on said disk, a

pawl mounted on a rock shaft adapted to engage with the teeth on said disk, said rock shaft being provided with a cam ar ranged to be operated by a cam on the looking part which operates the reversing mechanism, substantially as set forth.

11. In a grinding machine, the combination with the carriage operating shaft, of the reversing mechanism, means for operating said reversing mechanism, a cushioning device mounted on said shaft and connected with the driving gear wheel thereon by means of projections on one part extending between the ends of compressible springs contained in pockets in another part, a

pawl for locking said part carrying the springs temporarily, said pawl being mounted upon a rock-shaft, a cam also on said rock-shaft positioned to be operated by the means which operates the reversing mechanism, substantially as set forth.

12. In a grinding machine, the combination with the carriage driving shaft, of the driving mechanism, the reversing mechanism, means for operating said reversing mechanism, means for disengaging-the driving mechanism from the carriage driving shaft temporarily at each reversal thereof, a cushioning device adapted to receive the shock and strain incident to e stopping of the carriage while said gear is released and then expand to assist in starting the carriage in the reverse direction, substantially as set forth. I

13'. In a grinding machine, the combination with the carriage driving shaft, the v driving mechanism, the reversing mechanism, means for operating said reversing mechanism, a gear wheel on said carriage driving shaft adapted to mesh with said driving mechanism, said gear wheel being mounted to have a limited movement independent of said shaft, a sleeve secured to said shaft and having projecting arms, a disk or wheel mounted on said sleeve and having pockets coincident with'said arms, springs in said pockets adapted to bear on each side of said arms, means for locking said disk or wheel temporarily at each reversal of the carriage, and means for releasing said wheel when the gear engages for drivingthe carriage in the reverse direction, substantially as set-forth.

15. In a gninding machine, the combination with the carriage driving shaft, of the driving mechanism, the reversing mechanism, means for operating said reversing mechanism, and a cushioning device arranged to receive the thrust of the carriage at each operation of the reversing mechanism, substantially as set forth.

16. In a grinding machine, the combination, of a traversing carriage, a reversing and drive mechanism, and means by which the momentum is stored at the point of reversal at each end of each movement and used to start the carriage in the opposite direction, substantially as set forth.

17. In a grinding machine, the combmation, of a traversing carriage, a revers ng and drive mechanism, means by which power required to stop the carriage is stored at the point of reversal and used to start it in the opposite direction, and means for stopping the carriage at the reversing point a given time, substantially as set forth.

18., In a grinding machin'e, the comb1nation, of a traversing carriage, a reversing and drive mechanism, means by WlllCl'ltl'lG power required to stop the carriage is stored at the point of reversal and the carriage prevented from moving beyond the revers ing point in case of high traverse speed, and a traverse stop at point of reversal of said carriage, substantially as set forth.

19. In a grinding machme, the combination, of a traversing carriage, a reversing and drive mechanism, means by which inertie is stored at the point of reversal, by which the carriage is prevented from moving beyond the reversing point in case of high traverse speeds, and a traverse stop at point of reversal of said carriage, said stop being variable, substantially as set forth.

- 20. In a grinding machine, the combination, of a traversing carriage, a reversing and drive mechanism, meansto delay motion for a given period of said carriage at the point of reversal, and means to prevent shock in starting said carriage in the opposite direction, substantially as set forth.

21. In a grinding machine, the combination, of a traversing carriage, a reversing and drive mechanism, means to delay motion of said carriage at the point of reversal,

means for varying the delay of motion, and 1 means to prevent shock in starting said carset forth! means for varying the delay of motion, and

power required to drive the carriage, said means embodying springs, substantially as In Witness whereof, I have hereunto set my hand and [seal at ,Vaynesboro, Pennsylvania, this 10th day or December, AQD. nineteen hundred and six.

ABRAHA M B. LANDIS. [1 s1 lVitnesses l GEORGE BREZLER,

GEO. H. RUSSELL.

means to prevent shock in starting said earrlage 1n the opposite direction comprising 1I183DS iorstoring inertia nearly equal the 

